Radio Link Monitoring Method and Terminal Device

Abstract

A radio link monitoring (RLM) method and a terminal device, capable of improving the accuracy of performing RLM on an unlicensed frequency band. The method comprises: the terminal device performs RLM on a first resource; and the terminal device determines, according to an RLM measurement result on the first resource, and an RLM measurement result on a second resource or the reception of a downlink signal whether to report a synchronization IS indication and/or an out-of-synchronization (OOS) indication.

What is claimed is: 
     
         1 . A method for radio link monitoring, comprising:
 performing, by a terminal device, radio link monitoring (RLM) on a first resource; and   determining, by the terminal device, whether to report at least one of an in sync (IS) indication or an out of sync (OOS) indication according to a result of RLM measurement on the first resource, and a result of RLM measurement or a downlink signal reception condition on a second resource.   
     
     
         2 . The method according to  claim 1 , wherein determining, by the terminal device, whether to report the IS indication and/or the OOS indication according to the result of the RLM measurement on the first resource, and the downlink signal reception condition on the second resource, comprises at least one of:
 determining, by the terminal device, to report the IS indication, based on a determination that the result of the RLM measurement on the first resource is IS; or,   determining, by the terminal device, whether to report the OOS indication according to whether a downlink signal sent by a network device is received on the second resource, based on a determination that the result of the RLM measurement on the first resource is OOS.   
     
     
         3 . The method according to  claim 2 , wherein determining, by the terminal device, whether to report the OOS indication according to whether the downlink signal sent by the network device is received on the second resource, comprises at least one of:
 determining, by the terminal device, not to report the OOS indication, based on a determination that the terminal device receives the downlink signal on the second resource; or,   determining, by the terminal device, to report the OOS indication, based on a determination that the terminal device does not receive the downlink signal on the second resource.   
     
     
         4 . The method according to  claim 3 , wherein based on the determination that the terminal device receives the downlink signal on the second resource, the method further comprises:
 determining, by the terminal device, to report the IS indication.   
     
     
         5 . The method according to  claim 1 , wherein the second resource comprises at least one downlink resource within a predetermined time period before a third resource, wherein the third resource is used for reporting the result of the RLM measurement on the first resource. 
     
     
         6 . The method according to  claim 1 , wherein a plurality of measurement resources are included within one measurement period, and the plurality of measurement resources comprise the first resource and the second resource located after the first resource; and
 determining, by the terminal device, whether to report at least one of the IS indication or the OOS indication according to the result of the RLM measurement on the first resource, and the result of the RLM measurement on the second resource, comprises:
 stopping, by the terminal device, RLM on the second resource and determining to report the IS indication, based on a determination that the result of the RLM measurement on the first resource is IS. 
   
     
     
         7 . The method according to  claim 6 , wherein determining, by the terminal device, whether to report at least one of the IS indication or the OOS indication according to the result of the RLM measurement on the first resource, and the result of the RLM measurement on the second resource, comprises:
 continuing, by the terminal device, the RLM on the second resource, based on a determination that the result of the RLM measurement on the first resource is OOS, and determining to report the OOS indication until results of RLM measurement on the plurality of measurement resources are all OOS.   
     
     
         8 . The method according to  claim 1 , wherein performing, by the terminal device, the RLM on the first resource, comprises:
 performing, by the terminal device, a Signal to Noise-Interference Ratio (SINR) measurement on the first resource; and   the method further comprises:
 determining, by the terminal device, that the result of the RLM measurement on the first resource is IS, based on a determination that the measured and obtained SINR is greater than an in sync threshold Qin; and 
 determining, by the terminal device, that the result of the RLM measurement on the first resource is OOS, if the measured and obtained SINR is less than an out of sync threshold Qout. 
   
     
     
         9 . A terminal device, comprising:
 a processor, configured to perform radio link monitoring (RLM) on a first resource; to determine whether to report at least one of an in sync (IS) indication or an out of sync (OOS) indication according to a result of RLM measurement on the first resource, and a result of RLM measurement or a downlink signal reception condition on a second resource.   
     
     
         10 . The terminal device according to  claim 9 , wherein the processor is specifically configured to at least one of:
 determine to report the IS indication, based on a determination that the result of the RLM measurement on the first resource is IS; or,   determine whether to report the OOS indication according to whether a downlink signal sent by a network device is received on the second resource, based on a determination that the result of the RLM measurement on the first resource is OOS.   
     
     
         11 . The terminal device according to  claim 10 , wherein the processor is specifically configured to at least one of:
 determine not to report the OOS indication, based on a determination that the terminal device receives the downlink signal on the second resource; or,   determine to report the OOS indication, based on a determination that the terminal device does not receive the downlink signal on the second resource.   
     
     
         12 . The terminal device according to  claim 11 , wherein based on the determination that the terminal device receives the downlink signal on the second resource, the processor is further configured to:
 determine to report the IS indication.   
     
     
         13 . The terminal device according to  claim 9 , wherein the second resource comprises at least one downlink resource within a predetermined time period before a third resource, wherein the third resource is used for reporting the result of the RLM measurement on the first resource. 
     
     
         14 . The terminal device according to  claim 9 , wherein a plurality of measurement resources are included within one measurement period, and the plurality of measurement resources comprise the first resource and the second resource located after the first resource, and
 the processor is further configured to stop RLM on the second resource, based on a determination that the result of the RLM measurement on the first resource is IS; to determine to report the IS indication.   
     
     
         15 . The terminal device according to  claim 14 , wherein the processor is specifically configured to:
 continue the RLM on the second resource, based on a determination that the result of the RLM measurement on the first resource is OOS; and   the processor is further configured to determine to report the OOS indication until results of RLM measurement on the plurality of measurement resources are all OOS.   
     
     
         16 . The terminal device according to  claim 9 , wherein the processor is specifically configured to:
 perform a Signal to Noise-Interference Ratio (SINR) measurement on the first resource; and   the processor is further configured to:
 determine that the result of the RLM measurement on the first resource is IS, based on a determination that the measured and obtained SINR is greater than an in sync threshold Qin; and 
 determine that the result of the RLM measurement on the first resource is OOS, based on a determination that the measured and obtained SINR is less than an out of sync threshold Qout. 
   
     
     
         17 . A terminal device, comprising: a processor and a memory, wherein the memory is configured to store a computer program, and the processor is configured to call and run the computer program stored in the memory to execute the method according to  claim 1 . 
     
     
         18 . A chip, comprising: a processor, wherein the processor is configured to call and run a computer program from a memory, enabling a device disposed with the chip to perform the method according to  claim 1 . 
     
     
         19 . A computer readable storage medium, configured to store a computer program, wherein the computer program causes a computer to perform the method according to  claim 1 . 
     
     
         20 . A computer program product, comprising computer program instructions, wherein the computer program instructions cause a computer to perform the method according to  claim 1 .